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Quantum interference of single photons from remote nitrogen-vacancy centers in diamond

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arxiv 1112.3975 v2 pith:QBFJXAZ2 submitted 2011-12-16 quant-ph cond-mat.mes-hall

Quantum interference of single photons from remote nitrogen-vacancy centers in diamond

classification quant-ph cond-mat.mes-hall
keywords centersinterferencequantumdiamondnitrogen-vacancyphotonsremoteseparated
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy (NV) centers in distinct diamond samples separated by two meters. Macroscopic solid immersion lenses are used to enhance photon collection efficiency. Quantum interference is verified by measuring a value of the second-order cross-correlation function $g^{(2)}(0) = 0.35 \pm 0.04<0.5$. In addition, optical transition frequencies of two separated NV centers are tuned into resonance with each other by applying external electric fields. Extension of the present approach to generate entanglement of remote solid-state qubits is discussed.

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